Surfaces and Interfaces最新文献

Understanding the role of sodium lignosulphonate on obstructing the aggregation of fine serpentine particles on to the hydrophobized pyrite surface 了解木质素磺酸钠在阻碍细小蛇纹石颗粒聚集到疏水黄铁矿表面上的作用

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-10 DOI: 10.1016/j.surfin.2024.105426

Guangsheng Zeng, Wei Chen, Sheng Liu, Guangyi Liu

The slime coatings of serpentine via its hydrophobic Si-O layers significantly weaken the floatability of the hydrophobized sulfide minerals. In this paper, sodium lignosulphonate (SLS) was adopted to avoid the aggregation of fine serpentine particles on to the hydrophobized pyrite surface. The micro-flotation findings indicated that for the artificial mixture of pyrite and serpentine (2:1 mass ratio), 1.0 × 10^–4 mol/L sodium isobutyl xanthate (SIBX) only floated out ∼22 % pyrite at pH ∼9.0, while, after extra addition of 70 mg/L SLS, the floatability of pyrite was restored and its recovery reached ∼90 %. In situ AFM (Atomic Force Microscope), contact angle, zeta potential, fourier transform infrared spectrometer (FTIR) and optical microscope deduced that the strong affinity of SIBX to pyrite rendered it replace the most part of the pre-aggregated SLS from pyrite surface, thus to restore the hydrophobicity of pyrite and further decrease the zeta potential. In addition, SLS attached on the positively-charged Mg sites of serpentine through its carboxyl and phenolic hydroxyl groups reduce the hydrophobicity and zeta potential of serpentine. While, the hard base O atom/anion exhibited much stronger affinity to hard acid Mg cation than that of the soft base S atom/anion, SIBX hardly replaced the adsorbed SLS from serpentine surface. Therefore, the increased electrostatic repulsion and weakened hydrophobic attraction between the SLS-adsorbed serpentine and SIBX-hydrophobized pyrite avoided their aggregation. The combination of SLS and SIBX realized the selective flotation separation of pyrite from serpentine.

蛇纹石通过其疏水性 Si-O 层形成的粘液涂层大大削弱了疏水性硫化矿物的可浮性。本文采用木质素磺酸钠（SLS）来避免细小蛇纹石颗粒聚集到疏水性黄铁矿表面。微浮选结果表明，对于黄铁矿和蛇纹石的人工混合物（质量比为 2:1），在 pH ∼ 9.0 的条件下，1.0 × 10-4 mol/L 异丁基黄原酸钠（SIBX）只能浮出 ∼ 22 % 的黄铁矿，而在额外添加 70 mg/L SLS 后，黄铁矿的可浮性得到恢复，回收率达到 ∼ 90 %。通过原位原子力显微镜（AFM）、接触角、ZETA电位、傅里叶变换红外光谱仪（FTIR）和光学显微镜推断，SIBX与黄铁矿的强亲和力使其取代了黄铁矿表面大部分预聚的SLS，从而恢复了黄铁矿的疏水性，进一步降低了ZETA电位。此外，SLS 通过其羧基和酚羟基附着在蛇纹石带正电的镁位点上，降低了蛇纹石的疏水性和 Zeta 电位。与软碱 S 原子/阴离子相比，硬碱 O 原子/阴离子对硬酸镁阳离子的亲和力要强得多，而 SIBX 几乎无法取代蛇纹石表面吸附的 SLS。因此，吸附了 SLS 的蛇纹石与 SIBX 疏水化黄铁矿之间的静电排斥力增强，疏水吸引力减弱，从而避免了它们的聚集。SLS 和 SIBX 的结合实现了黄铁矿与蛇纹石的选择性浮选分离。

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引用次数: 0

Hydrophobic/hydrophilic surfaces constructed using laser spraying: A new route 利用激光喷涂技术构建疏水/亲水表面：一条新途径

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-10 DOI: 10.1016/j.surfin.2024.105422

Xinyu Ye , Xionghui Gui , Wanqing Wang , Chengjie Ge , Shuo Yin , Rocco Lupoi , Wenya Li , Xinkun Suo

Hydrophobic/hydrophilic coatings are widely applied in healthcare, construction, and electronic devices. However, low-cost preparation of coatings is a challenge because they are often associated with complex procedures and adverse environmental impacts. Therefore, an innovative low-cost and environmentally friendly laser spraying technology was employed to fabricate hydrophobic and hydrophilic Ni coatings. The wettability of the coatings was regulated by systematically varying laser power and substrate temperature. The Ni particles presented spherical morphology, low oxidation rate and low coverage rate (4 %) with a laser power of 3000 W and room temperature substrate, yielding a hydrophobic coating with a water contact angle of 125.9 ± 17.2° Conversely, Ni particles exhibited oblate spherical morphology, higher oxidation rate, higher coverage rate (95 %) and a porous structure with a laser power of 5400 W and a substrate temperature of 700 °C, resulting in a hydrophilic coating with a water contact angle of 8.4 ± 1.2° These findings demonstrate a novel approach for tailoring the wettability of the Ni coatings, offering new insights into the fabrication of functional coatings for various applications.

疏水/亲水涂层广泛应用于医疗保健、建筑和电子设备。然而，低成本制备涂层是一项挑战，因为这通常与复杂的程序和不利的环境影响有关。因此，我们采用了一种创新的低成本、环保型激光喷涂技术来制造疏水和亲水镍涂层。涂层的润湿性可通过系统地改变激光功率和基底温度来调节。在激光功率为 3000 W、基底温度为室温的条件下，镍颗粒呈现球形形态，氧化率低，覆盖率低（4%），产生的疏水涂层的水接触角为 125.9 ± 17.2° 相反，在激光功率为 5400 W、基底温度为 700 °C 的条件下，镍颗粒呈现扁球形形态、较高的氧化率、较高的覆盖率（95%）和多孔结构，从而产生了亲水涂层，水接触角为 8.4 ± 1.2° 这些发现证明了一种定制镍涂层润湿性的新方法，为制造各种应用的功能涂层提供了新的思路。

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引用次数: 0

Three-dimensionally assembled polyelectrolyte multilayers-functionalized silica nanowire membrane for highly-efficient adsorptive separation of copper ions from water 用于高效吸附分离水中铜离子的三维组装聚电解质多层功能化二氧化硅纳米线膜

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-09 DOI: 10.1016/j.surfin.2024.105420

Wei Tong , Chao Deng , Ruirui Zang , Pengchun Lan , Xinlan Li , Hsin-hui Shen , Yajun Wang

High-performance materials for heavy metal ion removal are highly demanded in environmental treatment. Membrane adsorption has the advantages of being easy to operate and avoiding secondary pollution. It remains challenging to prepare adsorption membranes with both high removal rate and high permeability. Here, we present a novel strategy for preparing poly(acrylic acid) (PAA) and polyethyleneimine (PEI) multilayer-assembled silica nanowires (SiO₂ NWs) membrane with abundant, multiple functional groups on a highly porous network for Cu(II) capture. The SiO₂ NWs in the hybrid membranes serve as a rigid 3D framework to improve membrane porosity and water flux, while the polyelectrolyte multilayers assembled on the SiO₂ NWs provide abundant, highly accessible adsorption sites for Cu(II) uptake. The adsorption capacity of the membranes can be tuned by changing the dosage of the assembled SiO₂ NWs and the PAA/PEI pair layers. The maximum adsorption capacity of the active polyelectrolyte layer for SiO₂ NWs@(PAA/PEI)₄ composite membrane was 272.5 mg/g toward Cu(II), outperforming the counterpart (PAA/PEI)₄ membrane (97.5 mg/g) after removal of the SiO₂ NWs framework. The hybrid membrane shows excellent adsorption performance for the removal of low concentrations of Cu(II) in a dynamic adsorption mode, and the removal rate is maintained at above 90 % after eight recycles.

环境处理领域对去除重金属离子的高性能材料有很高的要求。膜吸附具有操作简便、避免二次污染等优点。但要制备出既具有高去除率又具有高渗透性的吸附膜，仍然具有挑战性。在此，我们提出了一种在高孔隙网络上制备具有丰富的多种官能团的聚丙烯酸（PAA）和聚乙烯亚胺（PEI）多层组装二氧化硅纳米线（SiO2 NWs）膜的新策略，用于捕集 Cu（II）。混合膜中的二氧化硅纳米线是一种刚性三维框架，可提高膜的孔隙率和水通量，而组装在二氧化硅纳米线上的聚电解质多层膜则为铜(II)的吸收提供了丰富的、高度可及的吸附位点。膜的吸附容量可通过改变组装的二氧化硅氮核和 PAA/PEI 对层的用量来调节。SiO2 NWs@(PAA/PEI)4复合膜活性聚电解质层对Cu(II)的最大吸附容量为272.5 mg/g，优于去掉SiO2 NWs框架后的(PAA/PEI)4膜（97.5 mg/g）。在动态吸附模式下，该混合膜在去除低浓度的 Cu(II) 方面表现出卓越的吸附性能，而且在八次循环后去除率仍保持在 90% 以上。

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引用次数: 0

Releasing charge transport barriers at low bias in perpendicularly aligned 2D halide perovskite 在垂直排列的二维卤化物过氧化物中释放低偏压下的电荷传输障碍

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-09 DOI: 10.1016/j.surfin.2024.105405

Leonardo Quintero, Jose Antonio Souza

2D halide perovskites have garnered significant interest due to the great potential in optoelectronic devices. The 2D Perovskites samples are structured as n layers of [MX6]4− octahedral sheets inducing strong quantum confinement effects. Here, we have synthesized a series of 2D (BA)₂MA_n-1Pb_nI_3n+1 and its 3D counterpart by controlling the particles alignment to the substrate. We have performed a comprehensive study involving electrical transport and photoconductivity effect as a function of the particle's organization: parallel, perpendicular, and disordered orientation to the electrodes. We have observed that for intermediary value of n, the 2D layered particles are aligned perpendicular to the electrode and parallel to the transport electrical current. A distinct and complex S-shape behavior in V-i curves is disclosed, suggesting two electrical resistance regimes. The sharp increase in resistance suggests the presence of electronic barriers for all samples, which is suppressed for columnar arrays of n = 2 and 3 under illumination. We suggest that this linear behavior in the photoconductivity effect is close related to the absence of electrical barriers at the interface of the particles due to perpendicular alignment to the electrodes. The absence of interfaces in a more columnar array facilitates ionic conductivity enhancing photoelectric effect. Our findings reveal distinct differences in charge transport for perpendicularly aligned 2D samples, opening up possibilities for important applications at low bias.

二维卤化物过氧化物因其在光电设备中的巨大潜力而备受关注。二维过氧化物样品的结构为 n 层[MX6]4-八面体片，具有很强的量子约束效应。在这里，我们通过控制颗粒与基底的排列，合成了一系列二维 (BA)2MAn-1PbnI3n+1 及其三维对应物。我们进行了一项综合研究，涉及电传输和光电导效应与粒子组织的函数关系：与电极平行、垂直和无序取向。我们观察到，在 n 的中间值时，二维层状粒子垂直于电极排列，与传输电流平行。V-i 曲线呈现出明显而复杂的 S 形，表明存在两种电阻状态。电阻的急剧增加表明所有样品中都存在电子势垒，而 n = 2 和 3 的柱状阵列在光照下的电子势垒被抑制。我们认为，光电导效应中的这种线性行为与颗粒界面上由于垂直于电极排列而不存在电子势垒密切相关。在柱状阵列中没有界面有利于离子传导，从而增强光电效应。我们的发现揭示了垂直排列的二维样品在电荷传输方面的明显差异，为低偏压下的重要应用提供了可能性。

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引用次数: 0

Anisotropic fluorescence surface quenching of quantum dot-in-rods on silver nanopatterned film 银纳米图案薄膜上量子点内棒的各向异性荧光表面淬灭

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-09 DOI: 10.1016/j.surfin.2024.105416

Jie Zhou , Zhuonan Liu , Peiquan Yu , Weihao Wan , Ruotong Chen , Jianbo Xiao , Yujie Tao , Zhishuai Zheng , Yucheng Wang , Ziang Liu , Xiaoping Huang

Semiconductor quantum dot-in-rods (QDIRs) have served in the broad applications such as luminescent applications, sensor technology, quantum information processing, due to their polarized emission and polarized absorption characteristics. The localized surface plasmon resonance (LSPR) characteristics of the noble metal nanostructures can regulate the fluorescence intensity by controlling the radiation and non-radiation channels of fluorescent substances. However, the reports on the fluorescence surface quenching of QDIRs by plasmonic nanoparticles (NPs) are very rare. Herein, we propose a new method to realize QDIRs orientation, as well as the fluorescence intensity can be regulated. The effect of Ag nanopatterned film on the fluorescence surface quenching of QDIRs is discussed from both theoretical and experimental perspectives. Generally, the direct combination of Ag nanopatterned film and QDIRs results in 75% fluorescence surface quenching. Through FDTD simulation, we further analyzed the modulation of fluorescence intensity of the dipole source by the Ag nanopatterned film. This work will be useful for the development of QDIRs in the future.

半导体量子点棒（QDIRs）因其极化发射和极化吸收特性，在发光应用、传感器技术、量子信息处理等领域有着广泛的应用。贵金属纳米结构的局部表面等离子体共振（LSPR）特性可以通过控制荧光物质的辐射和非辐射通道来调节荧光强度。然而，关于质子纳米粒子（NPs）对 QDIRs 荧光表面淬灭的报道却非常罕见。在此，我们提出了一种实现 QDIRs 定向以及荧光强度可调的新方法。我们从理论和实验两个角度讨论了银纳米图案膜对 QDIRs 荧光表面淬灭的影响。一般来说，银纳米图案膜与 QDIRs 直接结合会导致 75% 的荧光表面淬灭。通过 FDTD 仿真，我们进一步分析了银纳米图案薄膜对偶极源荧光强度的调制。这项工作将有助于未来 QDIRs 的开发。

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引用次数: 0

Dual-functional Cu-Fe Co-Doped TiO₂ photocatalyst for efficient hydrogen production and phenol degradation 用于高效制氢和苯酚降解的 Cu-Fe 共掺 TiO₂ 双功能光催化剂

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-08 DOI: 10.1016/j.surfin.2024.105394

Dowon Jang, Younghwon Kim, Jaehun Lee, Hyunsub Shin, Misook Kang

This study presents a novel dual-functional photocatalyst, Cu-Fe co-doped TiO₂, that simultaneously addresses two critical global challenges: environmental pollution and sustainable energy production. Unlike most existing research focused on a single functionality, this study explores the synergistic effects of Cu and Fe doping on TiO₂, leading to simultaneous phenol degradation and hydrogen production under visible light irradiation. The 5Cu5Fe-TiO₂ photocatalyst, co-doped with 5 wt.% Cu and 5 wt.% Fe, exhibited outstanding performance, degrading 10 ppm of phenol within 6 h while generating 680 μmol/g of hydrogen. The catalyst showed remarkable stability over five recycling cycles without loss of efficiency. The Fe component significantly narrowed the TiO₂ bandgap, enhancing light absorption in the visible region, while the Cu component contributed to the formation of heterojunctions and surface plasmon resonance (SPR) effects, promoting efficient charge separation. These combined effects create a highly effective charge transfer mechanism, making the catalyst a promising solution for both environmental remediation and renewable energy generation. This work offers a cost-effective and scalable approach to dual-functional photocatalysis, opening up new avenues for sustainable technology development.

本研究提出了一种新型双功能光催化剂--Cu-Fe 共掺杂 TiO₂，可同时应对环境污染和可持续能源生产这两大全球性挑战。与大多数侧重于单一功能的现有研究不同，本研究探讨了 TiO₂ 上掺杂铜和铁的协同效应，从而在可见光照射下同时实现苯酚降解和制氢。共同掺杂了 5 wt.% Cu 和 5 wt.% Fe 的 5Cu5Fe-TiO₂ 光催化剂表现出卓越的性能，可在 6 小时内降解 10 ppm 的苯酚，同时产生 680 μmol/g 的氢气。该催化剂在五个循环周期内表现出极高的稳定性，而不会降低效率。铁成分大大缩小了 TiO₂的带隙，增强了可见光区的光吸收，而铜成分则有助于形成异质结和表面等离子体共振（SPR）效应，促进有效的电荷分离。这些综合效应形成了一种高效的电荷转移机制，使该催化剂成为环境修复和可再生能源发电的理想解决方案。这项研究为双功能光催化提供了一种具有成本效益且可扩展的方法，为可持续技术开发开辟了新途径。

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引用次数: 0

Stacking order and vertical strain controllable optoelectronic properties of van der Waals heterostructures constructed with germanene and double layer hexagonal structure AlAs 用锗烯和双层六边形结构砷化镓构建的范德华异质结构的堆积阶和垂直应变可控光电特性

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-08 DOI: 10.1016/j.surfin.2024.105413

Gang Guo , Yongcheng Chen , Lingyun Mao , Ping Li

In this study, we use first-principles calculations to investigate the structural and optoelectronic properties of DLHS-AlAs/germanene van der Waals heterostructures (vdWHs) with different stacking orders and vertical strain. The AIMD calculations and binding energies demonstrate that all three DLHS-AlAs/germanene vdWHs are thermally and energetically stable. The interesting transitions from semiconductor to metal and type-I to type-II band alignment can be observed in AB stacking vdWH under vertical strain regulation. Meanwhile, the Dirac cone is always well preserved in all vdWHs. The calculated optical absorption spectra indicate that all vdWHs show enhanced light absorption across the ultraviolet to visible light range, compared to their individual components. Besides, the application of vertical strain can result in the weakening or enhancement of ultraviolet light absorption coefficients in different regions of all vdWHs. Of particular interest is the observation that optical adsorption in the visible light region for all vdWHs is almost always enhanced and broadened with increasing vertical compression strain. These excellent and tunable optoelectronic properties suggest that DLHS-AlAs/germanene vdWHs may have favourable potential for use in optoelectronic devices.

在本研究中，我们利用第一原理计算研究了具有不同堆叠阶数和垂直应变的 DLHS-AlAs/锗范德华异质结构（vdWHs）的结构和光电特性。AIMD 计算和结合能表明，所有三种 DLHS-AlAs/锗烯范德华异质结构都具有热稳定性和能量稳定性。在垂直应变的调节下，AB 叠层 vdWH 可以观察到从半导体到金属以及从 I 型到 II 型带排列的有趣转变。同时，所有 vdWH 中的狄拉克锥始终保持完好。计算得出的光吸收光谱表明，与单个成分相比，所有 vdWH 在紫外光到可见光范围内都表现出更强的光吸收能力。此外，施加垂直应变会导致所有 vdWH 不同区域的紫外线吸收系数减弱或增强。尤其值得注意的是，随着垂直压缩应变的增加，所有 vdWH 在可见光区域的光吸收几乎都会增强和扩大。这些优异的可调光电特性表明，DLHS-AlAs/锗烯 vdWHs 在光电设备中的应用具有良好的潜力。

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引用次数: 0

Electrophoretic deposition of bioactive glass 58S- xSi3N4 (0 < x < 20 wt.%) nanocomposite coating on AISI 316L stainless steel substrate for biomedical applications 在 AISI 316L 不锈钢基底上电泳沉积用于生物医学应用的生物活性玻璃 58S-xSi3N4（0 < x < 20 wt.%）纳米复合涂层

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-08 DOI: 10.1016/j.surfin.2024.105380

Bahar Heidari Beni, Abbas Bahrami, Mojtaba Rajabinezhad, Mohammad Saeid Abbasi, Farnaz Heidari Laybidi

This paper aims to investigate the biocompatibility, bioactivity and properties of bioactive glass 58S-xSi₃N₄ (0 < x < 20 wt.%) nanocomposite coating on AISI 316 L stainless steel substrate, applied by electrophoretic deposition method. The implications of adding Si₃N₄ nanoparticles up to 20 wt.% to the bioactive glass coating for the structural and biomedical properties of deposited coatings were investigated. The deposited coating samples were characterized by X-ray diffraction (XRD) analysis, field emission scanning electron microscope (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), and energy dispersive X-ray spectroscopy (EDS). For the evaluation of cellular toxicity, the MTT cytotoxicity test with MG63 bone cell was performed. Bioactivity test was also conducted in simulated body fluid (SBF) up to 28 days. Results showed that increase in the Si₃N₄ content of composite samples is associated with a significant decrease in the average size of composite powder, inferring that Si₃N₄ additive has become nucleation sites during synthesis. Stereomicroscope images showed that with an increase in deposition time up to 70 min, a uniform coating can be attained. An increase in the Si₃N₄ content is associated with a significant reduction in surface roughness and non-uniformities of the deposited layer. The addition of Si₃N₄ in the composite layer slightly increases the wetting angle. The highest cellular toxicity was observed for the AISI 316 L sample at the concentration of 10 micromolar, while the lowest cellular toxicity is attributed to the BG-20 %Si₃N₄ sample at the concentration of 75 micromolar, exhibiting viability values similar to the control sample. Bioactivity assessment of deposited coatings indicated a remarkable improvement in the bone-forming ability of Si₃N₄-containing bioactive glass composite.

本文旨在研究采用电泳沉积法在 AISI 316 L 不锈钢基底上涂覆生物活性玻璃 58S-xSi3N4（0 < x < 20 wt.%）纳米复合涂层的生物相容性、生物活性和性能。研究了在生物活性玻璃涂层中添加 20 wt.% 的 Si3N4 纳米粒子对沉积涂层的结构和生物医学性能的影响。通过 X 射线衍射（XRD）分析、场发射扫描电子显微镜（FE-SEM）、傅立叶变换红外光谱（FTIR）和能量色散 X 射线光谱（EDS）对沉积涂层样品进行了表征。为了评估细胞毒性，对 MG63 骨细胞进行了 MTT 细胞毒性测试。此外，还在模拟体液（SBF）中进行了长达 28 天的生物活性测试。结果表明，复合材料样品中 Si3N4 含量的增加与复合材料粉末平均粒径的显著减小有关，推断 Si3N4 添加剂在合成过程中成为成核点。立体显微镜图像显示，随着沉积时间延长至 70 分钟，可获得均匀的涂层。随着 Si3N4 含量的增加，沉积层的表面粗糙度和不均匀性显著降低。在复合层中添加 Si3N4 会略微增加润湿角。浓度为 10 微摩尔的 AISI 316 L 样品的细胞毒性最高，而浓度为 75 微摩尔的 BG-20 %Si3N4 样品的细胞毒性最低，其活力值与对照样品相似。沉积涂层的生物活性评估表明，含 Si3N4 的生物活性玻璃复合材料的成骨能力显著提高。

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引用次数: 0

Impressive reinforcement on the anti-corrosion ability of the commercial fluorocarbon paint via an amino groups modified graphene 通过氨基修饰石墨烯显著增强商用氟碳漆的防腐能力

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-08 DOI: 10.1016/j.surfin.2024.105414

Qi Wang , Bingwei Zhong , Kang Hou , Jianmin Liang , Xiaoqian Zhao , Lu Wang , Hanxi Chen , Qiyu He , Yan Qu , Yaxuan Zheng , Huabing Tan , Yaqing Liu , You Zeng

The interaction with the matrix and the dispersion within the matrix hinder the realization of graphene's potential as an anti-corrosive filler. Herein, a -NH₂ modified graphene-based filler (PS-PVP@NH₂-rGO) was designed to simultaneously address these issues in the fluorocarbon resin (FEVE) coating. Reinforing FEVE coating with PS-PVP@NH₂-rGO, the wear rate and the lowest-frequency impedance modulus after a 7-day immersion were found to be 0.35 times and 177.3 times those of FEVE coating respectively. Ultraviolet-Visible spectra confirmed the excellent dispersibility of PS-PVP@NH₂-rGO. The designed differential scanning calorimeter experiment demonstrated the close interaction between PS-PVP@NH₂-rGO and the FEVE matrix. Due to this close interaction, PS-PVP@NH₂-rGO exhibited a high degree of dispersion within the FEVE matrix rather than self-aggregation, then concentrated the stress outside, absorbed energy produced during the friction process, and enhanced the coating's wear resistance. A complicated “labyrinth” was also created by the fillers. With chemical interactions, the fillers and the surrounding FEVE matrix formed an integrated whole, making the “obstacles” created by the fillers more significant. Consequently, the strong barrier effect resulted in superior anti-corrosion performances of PS-PVP@NH₂-rGO/FEVE coating. Introducing -NH₂ groups in was proven to effectively complete the coating, improve coating's quality and barrier effect, and finally prevent corrosive media. This study aims to provide design ideas and theoretical supports for high-performance heavy-duty anti-corrosive coatings.

与基体的相互作用以及在基体中的分散阻碍了石墨烯作为抗腐蚀填料潜力的发挥。在此，我们设计了一种 -NH2 改性石墨烯基填料（PS-PVP@NH2-rGO），以同时解决氟碳树脂（FEVE）涂层中的这些问题。用 PS-PVP@NH2-rGO 加固 FEVE 涂层，发现浸泡 7 天后的磨损率和最低频率阻抗模量分别是 FEVE 涂层的 0.35 倍和 177.3 倍。紫外-可见光谱证实了 PS-PVP@NH2-rGO 具有良好的分散性。设计的差示扫描量热仪实验证明了 PS-PVP@NH2-rGO 与 FEVE 基质之间的密切相互作用。由于这种密切的相互作用，PS-PVP@NH2-rGO 在 FEVE 基体中表现出高度分散，而不是自聚，从而集中了外部应力，吸收了摩擦过程中产生的能量，增强了涂层的耐磨性。填料还形成了一个复杂的 "迷宫"。通过化学作用，填料和周围的 FEVE 基质形成了一个整体，使填料造成的 "障碍 "更加明显。因此，强大的阻隔效应使 PS-PVP@NH2-rGO/FEVE 涂层具有卓越的防腐蚀性能。事实证明，引入 -NH2 基团可以有效地完善涂层，提高涂层的质量和阻隔效果，并最终防止腐蚀性介质的侵蚀。本研究旨在为高性能重防腐涂料提供设计思路和理论支持。

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引用次数: 0

Artificial photoelectric synaptic devices with ferroelectric diode effect for high-performance neuromorphic computing 用于高性能神经形态计算的具有铁电二极管效应的人工光电突触器件

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces

Pub Date : 2024-11-07 DOI: 10.1016/j.surfin.2024.105407

Zhifei Jian , Wenhua Li , Xingui Tang , Yongxi Liang , Renkai Zhao , Jiayu Tang , Yanping Jiang , Xiaobin Guo , Guowu Tang , Kai Yan

With the rapid advancement of artificial intelligence and machine learning, the demand for neuromorphic computing systems has intensified. High-performance artificial synaptic devices are crucial to achieving this objective. Ferroelectric diode artificial synaptic devices were prepared using aluminum-doped BaTiO₃ (BTAO) thin films by a low-cost sol-gel method. These devices mimic the basic properties of biological synapses, such as long-term plasticity (LTP) and short-term plasticity (STP), under electrical stimulation. Additionally, the devices exhibit an excellent UV light response, enabling the transition from STP to LTP by adjusting the light pulse intensity, width, and number of pulses. Aluminum doping significantly enhances the ferroelectricity of BaTiO₃ films, increasing the P_r from 2.31 µC/cm² to 9.08 µC/cm². By modulating the Schottky barrier through polarization, the BTAO films exhibit a switchable diode effect, which facilitates fine-tuning of the synaptic connection strength while maintaining synaptic stability. Recognition accuracies of 97.32 % for the MNIST dataset and 87.48 % for the Fashion-MNIST dataset were achieved by convolutional neural network simulations. These results suggest new possibilities for brain-like processing with ferroelectric diodes.

随着人工智能和机器学习的快速发展，对神经形态计算系统的需求也在不断增加。高性能人工突触器件对于实现这一目标至关重要。利用低成本溶胶-凝胶法，使用掺铝 BaTiO3（BTAO）薄膜制备了铁电二极管人工突触器件。这些器件模拟了生物突触在电刺激下的基本特性，如长期可塑性（LTP）和短期可塑性（STP）。此外，这些器件还具有出色的紫外光响应能力，通过调整光脉冲强度、宽度和脉冲数，可以从 STP 过渡到 LTP。铝掺杂大大增强了 BaTiO3 薄膜的铁电性，使 Pr 从 2.31 µC/cm² 提高到 9.08 µC/cm²。通过极化调节肖特基势垒，BTAO 薄膜表现出了可切换的二极管效应，这有助于微调突触连接强度，同时保持突触稳定性。通过卷积神经网络模拟，MNIST 数据集的识别准确率达到 97.32%，时尚-MNIST 数据集的识别准确率达到 87.48%。这些结果为利用铁电二极管进行类脑处理提供了新的可能性。

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